TY - JOUR
T1 - Rapid, convenient and low-energy preparation of spherical rare earth doped YAG phosphors by a laser sintering method
AU - Yuan, Rui
AU - Huang, Meng
AU - Zheng, Fei
AU - Li, Qian Li
AU - Xu, Zhan
AU - Hu, Jian Feng
AU - Zou, Jun
AU - Yang, Woochul
AU - Zhang, Zhi Jun
AU - Zhao, Jing Tai
N1 - Publisher Copyright:
© The Royal Society of Chemistry 2019.
PY - 2019
Y1 - 2019
N2 - In order to overcome the disadvantages of uncontrollable particle size, slow speed and high energy consumption existing in traditional phosphor preparation methods, we successfully prepared YAG:Ce and YAG:Dy phosphors rapidly and conveniently by using a laser sintering method with low energy consumption. The influence of different laser powers (3-27 W), scanning rates (50-800 mm s-1), powder thicknesses (50-800 μm), doping concentrations (0.25-1%), and post-treatments on their phase purity, morphology and optics was investigated. Spherical YAG phosphors with controllable particle size could be obtained through selecting appropriate parameters, and their PL intensity was enhanced by 300% after annealing; the average particle size was decreased to 46 μm after reducing the powder thickness to 50 μm. These results suggest that the reaction temperature and preparation period are greatly reduced compared with the conventional solid-state reaction method. A luminous efficiency (LE) of 80 lm W-1 and color rendering index (CRI) of 76.4 can be reached for the fabricated WLED using YAG:Ce phosphor, demonstrating its great potential applications in WLEDs. Interestingly, it is found that YAG:Dy phosphors exhibit red, pink, orange-yellow and pale-yellow emission color under various excitation wavelengths, showing significant potential application in the fields of anti-counterfeiting and fluorescent labeling. In short, according to our research, the laser sintering method has been proved to have a great potential application in the field of phosphor preparation.
AB - In order to overcome the disadvantages of uncontrollable particle size, slow speed and high energy consumption existing in traditional phosphor preparation methods, we successfully prepared YAG:Ce and YAG:Dy phosphors rapidly and conveniently by using a laser sintering method with low energy consumption. The influence of different laser powers (3-27 W), scanning rates (50-800 mm s-1), powder thicknesses (50-800 μm), doping concentrations (0.25-1%), and post-treatments on their phase purity, morphology and optics was investigated. Spherical YAG phosphors with controllable particle size could be obtained through selecting appropriate parameters, and their PL intensity was enhanced by 300% after annealing; the average particle size was decreased to 46 μm after reducing the powder thickness to 50 μm. These results suggest that the reaction temperature and preparation period are greatly reduced compared with the conventional solid-state reaction method. A luminous efficiency (LE) of 80 lm W-1 and color rendering index (CRI) of 76.4 can be reached for the fabricated WLED using YAG:Ce phosphor, demonstrating its great potential applications in WLEDs. Interestingly, it is found that YAG:Dy phosphors exhibit red, pink, orange-yellow and pale-yellow emission color under various excitation wavelengths, showing significant potential application in the fields of anti-counterfeiting and fluorescent labeling. In short, according to our research, the laser sintering method has been proved to have a great potential application in the field of phosphor preparation.
UR - http://www.scopus.com/inward/record.url?scp=85074439100&partnerID=8YFLogxK
U2 - 10.1039/c9tc04230j
DO - 10.1039/c9tc04230j
M3 - Article
AN - SCOPUS:85074439100
SN - 2050-7526
VL - 7
SP - 13070
EP - 13079
JO - Journal of Materials Chemistry C
JF - Journal of Materials Chemistry C
IS - 42
ER -